Ambient air at 100 kPa and 300 K is compressed isentropically in a steady-flow device to 0.8 MPa. Determine the work input to the compressor.

Answer in box is incorrect

Propane initially at 300 K and 100 kPa is is compressed to 1 MPa in a reversible, steady-flow, and compressor. Determine the amount of work in kJ/kg if the process is isothermal. Round your answer to one decimal place

A steady-flow compressor has R-134a entering at 120 kPa as a saturated vapor and exits at 800 kPa and 50°C, requiring 55 kJ/kg of work. Assume that the boundary of the compressor is at 30°C. What is the specific enthalpy of the R-134a at the inlet, in kJ/kg? What is the specific enthalpy of the R-134a at the outlet, in kJ/kg? How much heat transfer, in kJ/kg, exits the system?

Air is compressed in an adiabatic compressor. Inlet and outlet conditions are 120kPa, 30 oC and 20 m/s; 1.4 MPa, 530 oC and 80 m/s.  The surrounding air temperature is 25 oC. The inlet cross-sectional area is  0.013 m2. Assume Cp = 1005 J/kgK, R = 287 J/kgK, k = 1.4.   Enter the amount of heat loss due to irreversibility resulting from the heat transfer from the compressor in kW (correct up to one decimal place.)

Calculate the axial stress in a tube that is stretched by a tensile axial force of 4500 N if the tube has an outer diameter of 25 mm and an inner diameter of 20 mm.